Li Xiang, Zeng Lingling, Jiang Huating, Sui Jia, Shuang Bao, Zhu Liya, Tang Junqian, Dai Yingjie
College of Resources and Environment, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China.
School of Environmental Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China.
Sci Total Environ. 2025 Jan 1;958:178054. doi: 10.1016/j.scitotenv.2024.178054. Epub 2024 Dec 17.
In this study, we selected polyvinyl chloride (PVC), polyethylene (PE), and polystyrene (PS) as representative microplastics (MPs) to systematically investigate the sorption behavior of tetracycline (TC) antibiotics by MPs. Scanning electron microscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, and adsorption experiments were applied to assess the sorption behavior of MPs. The results demonstrated that the sorption of TC by MPs was most favorable under neutral conditions, where a modest increase in the salt ion concentration enhanced the adsorption of TC by MPs. The saturation adsorption capacities for PVC, PE, and PS for TC were determined as 121.95 μg/g, 81.301 μg/g, and 178.57 μg/g, respectively. The strength of TC sorption by MPs followed the order of: PS > PVC > PE. Analysis of the sorption behavior of TC by MPs showed that the adsorption of TC by PE was weak and it readily desorbed, and thus their interaction will not lead to excessive compound pollution. By contrast, the adsorption of TC was high by PVC and PS, and they were not readily desorbed.
在本研究中，我们选择聚氯乙烯（PVC）、聚乙烯（PE）和聚苯乙烯（PS）作为代表性微塑料（MPs），以系统地研究MPs对四环素（TC）抗生素的吸附行为。采用扫描电子显微镜、X射线衍射、傅里叶变换红外光谱和吸附实验来评估MPs的吸附行为。结果表明，MPs对TC的吸附在中性条件下最为有利，此时盐离子浓度的适度增加会增强MPs对TC的吸附。PVC、PE和PS对TC的饱和吸附容量分别测定为121.95μg/g、81.301μg/g和178.57μg/g。MPs对TC的吸附强度顺序为：PS＞PVC＞PE。对MPs对TC的吸附行为分析表明，PE对TC的吸附较弱且易于解吸，因此它们之间的相互作用不会导致过度的复合污染。相比之下，PVC和PS对TC的吸附较高，且不易解吸。
